Shaving machine



g. 11, 1942. 1 H, COHEN 2,293,015

SHAVING MACHINE Filed May 18, 1938 l INVENTOR ATTOR N Patented Aug. 11, 1942 SHAVIN G RIACHINEl Joseph H. Cohen, Bridgeport, Conn., assigner to Casco Products Corporation, Bridgeport, Conn., a corporation of Connecticut Application May 18, 1938, Serial No. 208,512

(Cl. 20o- 52) 13 Claims.

This invention relates to electric dry shaving devices, and, more particularly, to the means for controllably connecting the devices to a source of energy.

Dry shavers now generally used are connected to a source of energy by means of a separate conductor which is adapted to have one end attached to a light socket, or the like outlet, and have the other end connected to the shaving device by the usual male and female socket arrangement with the parts thereof frictonally held together. The conductor may be removed from the shaving device when the latter is not in use, so that the device can be more readily packed or stored in the usual receptacle provided for this purpose. When separated therefrom, there is always the danger of the conductor being mislaid and lost.

Further, if the razor should be suspended by the cord in this construction, as, for example, upon being dropped, the frictional connection in the male and female socket members usually will not be suilicient to hold the conductor and shaving device together and as a consequence of which the shaving device drops from the conductor and becomes broken.

Furthermore, these shaving devices usually do not have formed thereon means for controlling the circuit to the driving means for the cutter, but merely rely on the plugging in of the conductor cord to serve this function. In order to stop the device, one end of the cord must be disconnected. This becomes very inconvenient if, during the shaving operation, the user of the device is required to stop the razor a number of times, or is required to stop it in a hurry,

An object of the present invention is to provide a control means of simplified construction which is easily assembled and which includes a combined connector plug and switch member secured to the casing of the shaving device against removal therefrom. The conductors are secured to the plug member and, therefore, cannot be mislaid or released from the shaving device. Also, the shaving device, due to the conductors being secured thereto, can be suspended without fear of the latter becoming disconnected from the cord and falling and break- The combined connector plug and switch member of the present invention is mounted in a groove' in one end of the casing of the shaving device. with a portion thereof projecting therefrom to provide a grip means, whereby the plug is held against longitudinal movement on the casing and carries contacts which cooperate with contacts xed in the casing to control the circuit for energizing the shaving device. With this construction, the shaving device can be readily and conveniently stopped by merely rotating the plug on the casing.

The plug and casing are provided with interengagingr means which limit the rotation of the plug in either direction of rotation. In one of the limiting positions, the circuit will be closed through the cutting device, and in the other position the circuit will be open.

To prevent unintentional rotation of the plug, as, for example, by the cord attached thereto becoming twisted so as to apply a torque to the plug, detents are provided for holding the plug in either its open-circuit or closed-circuit position.

A feature of the present invention lies in the simplied switch construction which can be readily assembled in the casing at the time the razor is assembled and which will be held in assembled relation by the casing of the razor without any danger of becoming disarranged.

Other features and advantages of the invention will be apparent from the specification and claims, when taken in connection with the accompanying drawing, in which:

Figure 1 is a view of the shaving device with part of one-half of the casing broken away.

Figl 2 is a detailed view of a portion of Figure 1, with the switch in section.

Fig. 3 is a section taken along line 3-3 of Fig. 2.

Fig. 4 shows a top plan View of the assembled contacts.

Fig. 5 is a top plan view of the platey and fixed contacts.

Fig. 6 shows a top plan view of the rotatable plug andl contacts.

In the form of the invention illustrated in the drawing, a casing I0 has a cutter head Il mounted at the end thereof. The casing is hollow and is usually made in two longitudinal sections clamped together. Disposed within the hollow casing is a motor assembly l2 for driving can be given limited rotary movement. The plug 55 the cutter. the motor assembly is provided with a cylindrical bore I3.

In order to controllably supply energy to the motor for driving the cutter head, the present invention provides a novel and simple switch mechanism having one element thereof secured in xed position in the casing and a cooperable ele- The lower end of the casing below` jections |5la at opposite sides thereof, forminga mount for the 4fixed contacts of the switch. In the preferred form of the invention, the contacts are oppositely disposed on the plate and consist of tubular rivets extending through the plate and headed over. The desired number of contacts can be mounted on the plate and in the preferred form of the invention, two pairs of contacts i6, i8 are shown. A pair of connector lugs l1 are connected to the contacts i6 and are scoured to the plate l5 by having a portion thereof extending under the heads or the rivets and clamped against the plates. The connector lugs have portions extending outwardly from the plate and are adapted to have the motor leads secured thereto.

The second pair of contacts lil, which are formed by tubular rivets extending through the plate and headed over, are not connected in any circuit but form dead contacts which are cngaged when the switch is to be maintained in open-circuit position.

The plate l5 is xedly mounted in the casing against movement therein by being positioned in grooves i9 formed in the walls of the casing at the inner end of the cylindrical bore i3. The coaction between the rectangular projections 55a and the walls of the groove prevent the plate :from rotating while the side walls of the groove, cooperating with the plate, hold it against longitudinal movement in the casing.

A second groove 22 is formed in the bore i3 in the casing and is spaced from the groove i9. The cooperating movable member of the switch for controlling the circuit comprises a plug 23 rotatably disposed within the bore I3. The plug is held against longitudinal movement with respect to the casing by a flange 24 mounted in the groove 22, the side walls of the groove, cooperating with the flange, holding the plug against 1ongitudinal movement with respect to the casing.

One end of the plug projects from the opening in the end of the casing and is formed with ridges 25 or other grip-forming means whereby the plug can be readily gripped and rotated.

The other or inner end ofthe plug is disposed in a plane parallel to and adjacent the iixed contact-carrying plate and has mounted thereon contacts adapted to cooperate with the xed contacts to control the circuit to the motor in the shaving device. These contacts can be mounted as desired. In the preferred form of the invention, however, the inner surface of the plug is provided with a recess 28 in which is positioned an insulating plate 29 secured to the plug by suitable securing means 30.

A pair of wiping contacts 3| of resilient material are each secured at one end to the plate by a rivet 32 so as to be insulated from one another. The contacting face of the contact extends into a position in which it engages the contacts on the xed plate. The securing means for holding the plate 29 to the plug also penetrates the contact and serves to hold the contact againstl pivotal movement about the rivet as the plug is rotated.

The movable member of the switch is carried in which the contacts 3l engage the contacts I8 in open-circuit position or contacts I6 -in closedcircuit position. This is accomplished by cutting away a portion of the flange 24. as shown at 33, to provide a pair of abutments 34 andV 35 which cooperate with a projection 36 on the casing, as shown in dotted lines in Fig. 4.

The device is connected to a suitable source of energy by means of a cable 31 adapted to be connected to a lamp socket or other electrical outlet. The cable comprises a pair of conductors 38, 39 covered by the usual sheathing. The plug 23 has a central bore 40 which is restricted slightly at the outer end thereof at 4I. The restricted bore forms a shoulder dla as shown in Figs. 2 and 3. The conductors extend into the bore in the plug and are rigidly and securely connected to the movable contact plate by connector lugs 42. The connector lugs have at one end a tubular portion i3 adapted to receive the ends of the wires and have them secured thereto. The connector lugs are provided at their other ends with an eyelet M adapted to be disposed over the rivet and be clamped to the plate in electrical engagement with the Contact by the head of the rivet securing the contact to the plate. The conductors thus secured to the plug cannot be accidentally disconnected. As shown in Figs. 1 to 3, the connections are completely enclosed within the casing.

To relieve any strain which might be present in the switch due to the pull of the conductors on the contact plate, a strain-relieving sleeve H5, of rubber or the like resilient material, is adapted to be slipped over the ends of the conductors to frictionally engage and hold the cable and is locked to the plug against movement relative thereto. The sleeve is provided with a flange 86 adjacent one end and is locked to the plug by being passed through the large bore of the plug 'until the flange engages the shoulder dla formed by the restricted bore. The sleeve has a rib 41 thereon which is deformable so as to be passed through the restricted bore and which expands and engages the outer surface of the plug at the end of the plug so that it is securely locked against movement with respect to the plug. The sleeve grips the conductors and prevents any undue strains from being ytransmitted by the conductors to the contact plate 29 to which they are secured.

In order to prevent the plug from being unintentionally turned from either the open-circuit position or closed-circuit position, as, for example, by the conductor becoming twisted and imparting a torque to the rotatable member, the contact 3| is provided, on its contact-engaging face, with a projection 3Ia which is adapted to engage the bore of the tubular rivets, forming contacts I6 and I8, and form a detent for holding the plug in either of its positions.

The device oi the present invention can be readily assembled at the time the razor is being assembled. Each of the switch elements can be made up as units and can be assembled by merely positioning the fixed plate and rotatable plug in the grooves formed in the casing and connecting the leads of the motor to the lugs on the fixed contact plate. The grooves in the casing, when the two parts thereof are assembled, will securely hold the switch elements in predetermined cooperative relation.

Variations and modifications may Abe made within the scope of this invention and portions of the improvements may be used without others.

I claim:

1. In a switch for controlling the circuitof a power operated portable tool having a casing, fixed contacts carried by the casingfor electrical connection to the power operated -tool and a plug rotatablymounted on the casing and having contacts connected to a conducting means and cooperating with the fixed contacts for controlling the circuit upon rotation of the plug, the casing having a groove therein and the plug having a flange positioned in the groove with the walls of the groove cooperating with the flange to hold the plug against longitudinal movement on the casing during rotation thereof.

2. In a switch for use with a power operated electric portable tool having a casing, a plate having two pairs of contacts flxedly mounted on the casing with one pair of contacts electrically connected to the power-operated tool, and a plug rotatably supported by the casing and having spring contacts thereon movable into cooperative relation with either pair of fixed contacts, the casing having a groove therein to nonrotatably receive the plate with the walls of' the groove holding the plate against longitudinal movement.

3. A switch for use with a power operated electric portable tool having a casing, comprising contacts fixedly mounted in the casing for electrical connection to the power-operated tool, and a plug rotatably mounted on the casing and having an insulated plate secured thereto and wiping contacts mounted on the plate for cooperation with the fixed contacts, said wiping contacts being adapted to be electrically connected to a source of power, the casing having a groove therein and the plug having a flange positioned in the groove with the walls of the groove co'- operating with the flange to hold the plug during rotation, against longitudinal movement on the casing.

4. A switch for use with a power operated portable tool having a casing comprising contacts flxedly mounted on the casing and a plug rotatably mounted in the casing and having contacts thereon to cooperate with the fixed contacts, the casing having a groove therein and the means for mounting the fixed contacts comprising a plate nonrotatably mounted in the groove with the walls of the groove holding the plate against longitudinal movement on the casing, the casing also having a second groove in spaced relation to the first groove and the plug having a flange rotatably positioned in the second groove with the walls of the groove cooperating with the flange to hold the plug against longitudinal movement Cil able tool having a casing comprising fixed conportable tool having a casing, fixed contacts on the casing and a plug rotatably mounted on the casing and having contacts thereon to cooperate with the fixed contacts, the casing having a groove therein and the plug having a flange positioned in the groove with the walls of the groove cooperating with the flange to mount the plug for rotation; interengaging means on the casing and plug for limiting the rotation of the plug in either direction with respect to the casing; and detents for holding the plug against rotation from either of the limiting positions. l

7. In a switch for use with a power operated electric portable tool having a casing, fixed contacts mounted in, the casing and a plug having a flange rotatably mounted in a groove formed in the walls of id casing adjacent an end thereof, said plug ha ing contacts thereon to cooperate with the fixed contacts for controlling the supply of energy and having a portion thereof extending through an end opening in the casing to provide a grip whereby the plug can be manually operated, the walls of the groove cooperating with the flange on the plug to hold the plug against longitudinal movement on the casing.

8. In a switch for use with a power operated electric portable tool having a casing, fixed contacts on the casing and a plug rotatably mounted on the casing and having contacts thereon to cooperate with the fixed contacts, the casing having a groove therein and the plug having a flange positioned in the groove with the walls of the groove cooperating with the flange to hold the plug against longitudinal movement; and detents for holding the 'contacts in closed-circuit position.

9. In a switch for a power operated portable tool having a casing, a plate having two pairs of contacts having depressions therein fixedly mounted'on the casing with one pair of contacts electrically connected to the power-operated tool, and a plug rotatably mounted on the casing and having spring contacts thereon extending into cooperative'relation with the fixed contacts and provided with projections to engage the depressions in either pair of-fixed contacts to hold the switch in a position in which the circuit is closed through one pair of' contacts to the power-operated tool or to the unconnected contacts in opencircuit position, the casing having a groove therein to nonrotatably receive the plate with the walls of the groove holding the plate against longitudinal movement.

10. A switch for a power operated portable tool having a casing, fixed contacts carried by the casing and power connected to the electrically operated tool and a plug rotatably mounted on the casing and having contacts thereon cooperating with the fixed contacts, the-casing having a groove therein a-nd the plug having a flange positioned in the groove with the walls of the groove cooperating with the flange to hold the plug against longitudinal movement on the casing; and a strain-resisting sleeve adjacent the plug and embracingly surrounding a conducting means for connecting said tool to a source of current, said sleeve having means thereon for locking it to the plug.

11. In an electric power operated portable tool, a casing; a power-operated tool carried by the casing; an energy-supplying circuit for the power-operated tool comprising conducting means and switch means, the switch means comprising contacts flxedly mounted in the casing and electrically connected to the power-operated tool, and a plug rotatably mounted on the casing and having an insulated plate secured thereto and resilient wiping contacts mounted on the plate for cooperation with the fixed contacts and connected to the conducting means, the casing having a groove therein and the plug having a flange positioned in the groove with the walls of the groove cooperating-with the flange to hold the plug against longitudinal movement on the casing, the plug being provided with a central aperture through which the conducting means is inserted; and a strain-relieving sleeve surrounding and gripping the conducting means and having means whereby it is locked in the central aperture of the plug against relative movement with respect thereto.

12. A switch for use with a power-operated portable tool having a casing; xed contacts on the casing; a plug rotatably mounted on the casingand having contacts thereon to cooperate with the fixed contacts, the casing having a groove therein and the plug having a ilangve positioned in the groove with the walls of the groove cooperating with the ange to mount the plug for rotation and against longitudinal movement in the casing; and means in the groove and cooperating with abutments formed on the flange for limiting a rotative movement of the plug.

13. A switch for usewith a power-operated portable tool having a longitudinal split casing provided with a pair of parallel transversely extending internal grooves therein comprising contacts ilxedly secured on a plate mounted in a groove in the casing; and a plug having contacts thereon to cooperate with the fixed contacts rotatably mounted in the other groove, said plate and groove providing means for holding the xed contacts nonrotatably in the casing and against longitudinal movement on the casing and said other groove rotatively receiving a portion of the plug and holding the plug against longi tudlnal movement in the casing whereby the plug and plate are held in proper relation and the plug can be moved to carry the contacts into and out of engagement with the llxed contacts carried by the plate.

JOSEPH H. COHEN.

CERTIFICATE OF CORRECTION.'

. Patent No. Y2,295,015. August 1'1, 19m.

JOSEPH H. COHEN It is hereby certified that error appears in the printed specification ofthe above numbered patent requiring correction as follows: Page 5, aecond column, line 14.8, claim lO, for "A switch" read --In a sw1tch'; line 50, same claim, for "poner connected to tne electrically read '--electrical- 1y connected to the power--g and that the said Letters Patent should be read vgith this correction therein that the same may conform to the record of the case in the Patent Office. A

signed and sealed this 29th day of september, A. D. 19kg.

1 Henry Van Arsdale,

(Seel) Acting Comnissioner of Patents. 

